Hook assembly for engaging a spinal column

Details Hook assembly for engaging a spinal column Hook assembly for engaging a spinal column

1979-06-04

1981-05-26

Michell, Robert W.

Surgery

Truss

Perineal

128 92EA, 403 43, 403342, 24263A, A61F 501, F16B 706

Patent

active

042691788

ABSTRACT:
An apparatus used in the treatment of spinal fractures and scoliosis. A threaded rod carries 2 or more sleeves, each sleeve surrounding a portion of the rod and slideable along the entire length of the rod. Each sleeve engages a hook to interconnect the rod with the hook. The hook includes a base for engaging the sleeve. The base has a bore therethrough which receives the sleeve, and a slot is located parallel to and communicating with the bore. The slot has a width which is greater than the diameter of the rod and less than the outside diameter of the sleeve so that the rod can be placed into the slotted base of the hook and held in position by the sleeve which is slipped over the rod and into the bore. A projecting hook portion is integrally connected with the base and is used to engage the bone of the spinal column. A locking system in the form of threaded nuts engages the rod securing the position of the sleeve so that the entire hook assembly may be held in place with respect to the rod. When hooks are faced toward each other on a rod, compression is achieved by advancing the threaded units. Likewise, distraction is achieved by reversing the hooks so as to be facing away from each other. The bore in the base may be tapered or may have a smaller portion to prevent the sleeve from sliding completely through the bore. Opposing openings are located on either side of the base for movement by an instrument, such as a hook holder, to aid in the placement of the hook assembly before interconnection with the threaded rod. Preferably, the hook assembly forms a part of a Harrington compression rod or a tensioning means which interconnects a Harrington distraction rod and a Harrington compression rod.

REFERENCES:
patent: 3242922 (1966-03-01), Thomas
Harrington Spine Instrumentation; Zimmer Catalog 1973-Warsaw, Indiana 46580-p. A-108.
Cotrel; "New Techniques for the Treatment of Idiopathic Scoliosis", Internat'l. Orth., Spring 1978, pp. 247-265.
American Ortomed Corporation Catalog; P.O. Box 3184, Poughkeepsie, N.Y. 12603.

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